Hi Lippischh,
I edited your render and attached it.
Your controlsurfaces are just cut out instead of real geometry?It is better to model a real controlsurface and a real indent in the wing then just a hole in the wing.
I have make a psd which you can open in Photoshop or a similar program.
I had to fake all the layers, but I am sure your software can make those layers. (what software do you use?)
The result is a more realistic looking render.
In short: you need to copy your colormap and use it as a reflective colormap (most software have this option)
then you need to copy the colormap to the specular colormap ( not all software use this term or have the option to set it)
then you will notice that your colors will be deeper.
Then you need to add a occlusionmap, this is a rendermap that works with distances, short distances will give a darker color then greater distances.
It is also called a dirt-shader in some software.
In the psd I faked the distance between the wing and the fuselage, you can clearly see some darker part between the wing and fuselage.
If you put and occlusionmap ontop of a render, it will look more real.
If you have any more questions, let me know,
Cheers,
Rob
http://www.baroba.be/files/16_edited.zip